Abstract: A control board includes a storage module and a control module. The storage module includes a configured memory space and a non-configured memory space. The non-configured memory space further has at least one first storage unit, and each of the at least one first storage unit stores a first configuration document. The control module connected with the storage module switches to load the first configuration document under a control of a switch instruction by referring to a first mapping table, and bases on the first configuration document after the switching to allot a plurality of hard disk drives of a disk drive group connected with the control board to corresponding communication ports of the control module. Thus, access permission can be set in a physical layer of the expander board through at least one configuration document, and a certain number of storage units are allotted to store the configuration document.